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A literature search was conducted covering studies published between 2016 and 2025 using platforms including PubMed, Web of Science (WoS), Scopus, and Google Scholar
Gastrointestinal issues, such as diarrhea, nausea and constipation, are perhaps the most widely reported side effects (research has found that these impact up to 60% of users)
Studies show it promotes nerve health and reduces pain
This absorption challenge is why injectable formulations remain the standard for weight management therapy, where consistent dosing and predictable absorption matter for long-term results
Frequently Asked Questions Can B12 Shots support weight management
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